George meets her match in this thirteenth FAMOUS FIVE adventure: with Henrietta (or Henry, as she prefers to be called), who is intent on acting like a boy, and the first few chapters of this fantastic book are based purely on their disliking of each other. It seems as if George's cousins: Julian, Dick and Anne are in for an awkward time, when George refuses to let Henry join their company but will the fiery tomboy prove to be more decent than George expected, when a mystery evolving around the atmospheric: Mystery Moor, emerges, and the children find themselves: yet again, caught up in another adventure!